i have never assumed that reincarnation was not forced. it is true we are not these bodies we wear. what makes up what we usually think of as being ourselves is a collection of various elements (ie: form, sensation, emotion, thought, and consciousness) when we die these things scatter and are reborn. for example your physical form decomposes and becomes part of the ecosystem. its all very lion kingish. the consciousness though seeks out a new body. due to deep seeded craving and desire for a family, a home, a body. the consciousness is forced back into a new life. this is not good as this existence in all of its various forms is not our natural state. life as we know is filled with sickness, suffering, loss, the pain of being separated from loved ones, the pain of being joined with those we don't care for, etc.
one could argue that life is filled with beauty and wonderful things. this is true. this very human existence is exceedingly rare and precious. none the less our lives are still filled with suffering.
rebirth is the law we are forced under by the deep karmic seeds in our consciousness but it is not the extent of who we are or what we are capable of experiencing.
of course this is all a very buddhist understanding of it and i'm sure many will disagree. but variety is one of those things that does make life beautiful
kurukulla